package com.crm.controller.system;

import cn.hutool.core.codec.Base64;
import com.crm.base.ResponseResult;
import com.crm.constans.Constants;
import com.crm.utils.RedisCache;
import com.crm.utils.uuid.IdUtils;
import lombok.RequiredArgsConstructor;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import com.google.code.kaptcha.Producer;
import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

/**
 * @author Xanny
 * 验证码生成
 */
@RestController
@RequiredArgsConstructor
public class CaptchaController {

    private final RedisCache redisCache;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    /**
     * 生成验证码
     * @param response
     * @return
     */
    @GetMapping("/captchaImage")
    public ResponseResult getCaptcha(HttpServletResponse response) {

        // 保存验证码信息
        String uuid = IdUtils.simpleUUID();

        //Redis 中的唯一标识key
        String verifyKey = "captcha_codes:" + uuid;

        String capStr = null, code = null;
        BufferedImage image = null;

        //生成验证码
        String capText = captchaProducerMath.createText();
        capStr = capText.substring(0, capText.lastIndexOf("@"));
        code = capText.substring(capText.lastIndexOf("@") + 1);
        image = captchaProducerMath.createImage(capStr);


        redisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try
        {
            ImageIO.write(image, "jpg", os);
        }
        catch (IOException e)
        {
            return ResponseResult.error(e.getMessage());
        }

        return  ResponseResult.success().put("uuid", uuid)
                                .put("img", Base64.encode(os.toByteArray()));
    }
}
